"Legs eleven" is a popular phrase used in British bingo to refer to the number 11. The phrase originates from the visual resemblance of the number 11 to a pair of legs standing together. When the number 11 is called in bingo, the caller may say "legs eleven" to add a bit of fun and rhythm to the game. The phrase has become a bit of a cultural reference in the UK, sometimes used more broadly to evoke the image of slender legs or as a playful expression in other contexts.